Make sure 'user.options' is loaded before 'ext.visualEditor.viewPageTarget.init'

The function init.isAvailable uses mw.user.options, so this dependency needs
to be specified.

Change-Id: Ia2c87a32f692da2347ad670cdbcf6d6e6d171f15
Merge "Make sure 'user.options' is loaded before 'ext.visualEditor.viewPageTarget.init'"